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NEETChemistryClassification of Elements and Periodicity in Properties

Why is the electron gain enthalpy of O or F less negative than that of the succeeding element (S or Cl)?

Options

  1. AOxygen and fluorine have smaller atomic sizes.
  2. BOxygen and fluorine have lower effective nuclear charges.
  3. COxygen and fluorine have higher electron-electron repulsion.
  4. DOxygen and fluorine have larger atomic radii.

Correct answer

C. Oxygen and fluorine have higher electron-electron repulsion.

Step-by-step solution

The electron gain enthalpy of O or F is less negative than that of the succeeding element (S or Cl) because when an electron is added to O or F, the added electron goes to the smaller n = 2 quantum level and suffers significant repulsion from the other electrons present in this level.

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